Merasionalkan Bentuk Akar

\begin{equation*}
\begin{split}
& \frac{3}{2\sqrt{7}} \quad {\color {blue} \times \frac{\sqrt{7}}{\sqrt{7}}}  \\\\
& \frac{3\sqrt{7}}{14} \\\\
& \frac{3}{14} \sqrt{7}
\end{split}
\end{equation*}